TI-2026-39851 Aliases CVE-2026-55163 GHSA-x3vf-mgxj-7785

Lemur: Privilege escalation via PUT /api/1/roles/<id> — non-admin role members can rewrite role membership

LOW 27CWE-863Published 2026-08-18 · Updated 2026-08-19

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: Low · Low · Low
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-863.

Summary

Lemur manages TLS certificate creation. Prior to 1.9.2, PUT /api/1/roles/ in lemur/roles/views.py:298 authorized updates with RoleMemberPermission(role_id), which allowed either an administrator or any existing member of the target role. The handler passed data["users"] and data["name"] to service.update, allowing a non-admin member to add or remove other users and rename the role. This enabled lateral privilege grants within roles that control certificate and authority access and could deny access by removing legitimate members. The DELETE handler already required admin_permission, confirming that the weaker PUT authorization was inconsistent. The fix applies the same administrator-only requirement to the PUT handler. This issue is fixed in version 1.9.2.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00216 12th percentileScored 2026-11-07

Fix Fixed lemur (Netflix): 1.9.2lemur (PyPI): 1.9.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Netflix	lemur	before 1.9.2	1.9.2	Patch available	CNA
—	lemur (PyPI)	before 1.9.2	1.9.2	Patch available	GHSA-x3vf-mgxj-7785

lemur VendorNetflix Affected before 1.9.2 Fixed in 1.9.2 Patch available CNA
lemur (PyPI) Vendor— Affected before 1.9.2 Fixed in 1.9.2 Patch available GHSA-x3vf-mgxj-7785

Remediation

Fix · CNA lemur (Netflix) Fixed in 1.9.2
Fix · GHSA-x3vf-mgxj-7785 lemur (PyPI) Fixed in 1.9.2 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-55163
2026-10-03 Alias added: GHSA-x3vf-mgxj-7785

References

Other 4

TI-2024-04374 Path Traversal vulnerability via File Uploads in Genie CVSS 3.1CRITICAL 9.9
TI-2023-21044 Dispatch writes JWT tokens in error message CVSS 3.1CRITICAL 9.1
TI-2026-39854 Improper authorization in Netflix lemur CVSS 3.1CRITICAL 9.9
TI-2026-32272 Lemur: LDAP Filter Injection enables post-authentication privilege escalation CVSS 3.1HIGH 8.1
TI-2026-49966 Lemur: Unchecked `replaces[]` lets any user silence notifications and hijack auto-rotation for arbitrary certificates CVSS 3.1HIGH 8.1
TI-2026-49965 Missing authorization in Netflix lemur CVSS 3.1HIGH 7.7

See all 33 →

Sources

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